I just downloaded battery monitor app to figure out why my new phones battery is draining so quickly...

The app says though it's best to charge only up to 80%.

But logically if this were true, shouldn't the manufacturer adjust for it themselves so that when Android says 100... In reality it's actually 80?

Nope, then their would be lawsuits for "batteryGate"

The battery should* be charged up to 80% and discharged to 30% to extend its life... but fuck it, I still have iPhone 4s that still powers up and was always charged to 100% and let run flat.

*according to people, I don't trust people.

For long lasting battery its best to not visit the extreme ends of the range and to protect it from extreme temperatures.

I do not follow that fully but what I do do is to not leave it in the charger when full.

If kept in the charger it will continue to top of the charge and that is a real killer for most batteries.

And you might have read about that kind of battery management that fo not allow to discharge below 30%.

Tesla have on numerous occasions increased the range of their cheeper cars with several miles just through software.

That is done by temporarily removing such a battery limit in cases of emergency.

Keeping it between 20% and 80% is best for battery life, but it also reduces the momentary range to 60% of the capacity, which is what many customers wouldn't like.

Ideally, there should be a system app to control the charge/discharge limits, but manufacturers don't care because killing the battery in devices where it's difficult to change will boost new sales.

@C0D4 This has been well-researched, and it's true with lithium ion batteries. That's why Tesla recommends that, given that their products are meant for longer use.

@Fast-Nop I usually charge overnight though so not sure how to keep it at < 80%.

But guess good to know though without a full charge, the phone can't last even a full day outside.

Usually I just use a battery pack.

@donuts With properly designed devices, that's a device setting. Smartphones however are pieces of shit, so that's not implemented.

Satellites and cars limit the maximum voltage of li-ion cells torbay the devices must last for multiple years. Smartphones are single use items so the battery capacity is maximised when you buy it, and it doesn't matter if the capacity has degraded to 60% after one year.

Li-ion cells degrade the higher voltage you charge them to, but also if you overdischarge them (usually if you let them sit empty for months). Another causes for premature degradation are high charging and discharging currents (fast charging) and high or low temperatures.

@donuts you can use Advanced Charging Controller app, which you can get from Magisk.

@electrineer what's a torbay. My smartphones usually last for years.

Only on my 4th phone since Android can't out and the latest upgrade was just to get a Google only feature...

New phone can't root because it needs to pass all the security checks and don't want to get fired for using an unsecure device even if it did but then they find out later.

@donuts I have no fucking clue what torbay is, lol. I probably meant to write 𝘣𝘦𝘤𝘢𝘶𝘴𝘦.

So, phones adapt the speed at which they charge depending on how charged it is. this mainly solves the problem.

My phone has two batteries, one external and one internal and the option to only engage the external when the internal is at 80% comes out of the box.

The idea is to keep the base battery at 80% rest state for as much as possible. It seems to be a really good condition to be in for batteries, though I don't know the physics behind it

@atheist no, where did you get that idea from?

@Hazarth it's probably because it's the highest level of charge that doesn't significantly accelerate degradation.

Shouldn't be a problem on a modern smartphone.

The trick is to bring it quickly to 80% then 1C charging to 95% before trickle charging to full.

Also draining it down to flat isn't actually flat anymore.

Don't drop below 3.6v or raise above 4.2v

Could you all send links to where you found this information? Thank you 🙂

@electrineer well it does matter when a full charge does not take you through the day.

By being careful my iphones have never dropped below 80% of original max before I go a new one.

And I started with 4, switched to a used no6 about when 6S was released and just this summer to the new SE, so they have lasted several years each ;)

And even my model 6 that I had for about 6 years where still at about 84% of its original max charge in the end.

@eo2875 https://batteryuniversity.com/